#include<stdio.h>
#include<stdlib.h>

int main()
{
    int year,month;
    scanf("%d,%d", &year,&month);
    switch (month)
    {
    case 1:
    case 3: 
    case 5: 
    case 7: 
    case 8: 
    case 10: 
    case 12:
        printf("31\n");
        break;
    case 4: 
    case 6: 
    case 9: 
    case 11: 
        printf("30\n");
        break;
    case 2:
        if((year%4==0&&year%100!=0)||(year%400==0))
            printf("28\n");
        else
            printf("29\n");
        break; 
    default:
        printf("输入月份不在合法范围内\n");
        break;
    }
    system("pause");
    return 0;
}